tweetfight

A tweet fight is a topic battle that takes place on the Twitter social network. Two or more people may start a tweet fight; similar to a meme, but with the pretense of someone "winning".
A tweet fight starts similarly to Street Fighter in that you announce the fight, name your challengers, name the topic and then fight. (see example)
Tweet Fights can also be compared to a "Yo Mama" fight.

The first rule about #tweetfight is:

1. There are no rules.

@ohsnapitsMegan: @offdutygnome READY! #tweetfight :
Yo Mama : FIGHT!

@offdutygnome: @ohsnapitsMegan Yo Mama got a wooden leg with a kickstand!

@ohsnapitsMegan: @offdutygnome Yo Mama so fat and stupid she heard it was chilly outside so she grabbed a bowl and a spoon!

tweetfight by TorchesTogether5 July 24, 2009

Twitfight 

A situation on twitter where two obviously bored aliens engage in a back and forth war with 140 characters of ammunition, mostly accompanied by revelation of secrets like sex for blackberry bold to mention just a few.

1. @speakyourmindd : twitfight!!!!!!!! Piers Morgan & Sir Sugar are at it again!!

2. There was a twitfight between Rihanna and Ciara again yesterday, Ciara accused her of kpanshing Ray J for a blackberry bold

Twitfight by Maestrodamuz June 9, 2011

Tweelight

The light emanating from a computer or phone, reflecting off the face of the user, while they are using Tweet

His face is always illuminated with Tweelight, the light from his Twitter timeline.

Tweelight by ABBent1 November 4, 2011